/Engine/Plugins/Developer/Concert/ConcertMain/Source/Concert/Public/IConcertSession.h
Send a custom request to the given endpoint
template<typename RequestType, typename ResponseType> [TFuture](API\Runtime\Core\Async\TFuture)< ResponseType > SendCustomRequest ( const RequestType & Request, const [FGuid](API\Runtime\Core\Misc\FGuid) & DestinationEndpointId )